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Stock-Based Compensation - Exercise Price Range (Details) - Stock options and SARs
shares in Thousands
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding (in shares) | shares 4,371
Outstanding, Weighted- Average Remaining Contractual Life 2 years 5 months 24 days
Outstanding, Weighted- Average Exercise Price (in usd per share) $ 17.36
Number Exercisable (in shares) | shares 2,992
Exercisable, Weighted- Average Exercise Price (in usd per share) $ 18.21
$8.24 - $8.25  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range (in usd per share) 8.24
Range of Exercise Prices, Upper Range (in usd per share) $ 8.25
Outstanding (in shares) | shares 740
Outstanding, Weighted- Average Remaining Contractual Life 2 years 7 months 10 days
Outstanding, Weighted- Average Exercise Price (in usd per share) $ 8.24
Number Exercisable (in shares) | shares 493
Exercisable, Weighted- Average Exercise Price (in usd per share) $ 8.24
$11.65 - $11.65  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range (in usd per share) 11.65
Range of Exercise Prices, Upper Range (in usd per share) $ 11.65
Outstanding (in shares) | shares 1,700
Outstanding, Weighted- Average Remaining Contractual Life 2 years 6 months 4 days
Outstanding, Weighted- Average Exercise Price (in usd per share) $ 11.65
Number Exercisable (in shares) | shares 1,133
Exercisable, Weighted- Average Exercise Price (in usd per share) $ 11.65
$22.50 - $22.50  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range (in usd per share) 22.50
Range of Exercise Prices, Upper Range (in usd per share) $ 22.50
Outstanding (in shares) | shares 1,700
Outstanding, Weighted- Average Remaining Contractual Life 2 years 6 months 4 days
Outstanding, Weighted- Average Exercise Price (in usd per share) $ 22.50
Number Exercisable (in shares) | shares 1,133
Exercisable, Weighted- Average Exercise Price (in usd per share) $ 22.50
$30.72 - $51.84  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range (in usd per share) 30.72
Range of Exercise Prices, Upper Range (in usd per share) $ 51.84
Outstanding (in shares) | shares 133
Outstanding, Weighted- Average Remaining Contractual Life 2 years 1 month 22 days
Outstanding, Weighted- Average Exercise Price (in usd per share) $ 48.36
Number Exercisable (in shares) | shares 133
Exercisable, Weighted- Average Exercise Price (in usd per share) $ 48.36
$52.98 - $52.98  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range (in usd per share) 52.98
Range of Exercise Prices, Upper Range (in usd per share) $ 52.98
Outstanding (in shares) | shares 25
Outstanding, Weighted- Average Remaining Contractual Life 10 months 18 days
Outstanding, Weighted- Average Exercise Price (in usd per share) $ 52.98
Number Exercisable (in shares) | shares 25
Exercisable, Weighted- Average Exercise Price (in usd per share) $ 52.98
$53.91 - $53.91  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range (in usd per share) 53.91
Range of Exercise Prices, Upper Range (in usd per share) $ 53.91
Outstanding (in shares) | shares 74
Outstanding, Weighted- Average Remaining Contractual Life 1 year 30 days
Outstanding, Weighted- Average Exercise Price (in usd per share) $ 53.91
Number Exercisable (in shares) | shares 74
Exercisable, Weighted- Average Exercise Price (in usd per share) $ 53.91